I have just had a play with the 190 sub-X.
I loaded up 6 rounds from 7gns to 12gns of Trail Boss at 1gn intervals. They didn't go supersonic until 12gns which has surprised me (1gn more than the 200gn Lapuas I was using previously). I am going to load up another batch between 10gns and 11gns tonight and see how they go.
Rifle is a 16" T3.
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